yeah i dont think you can change that feature when its on extend mode. Why do you want it to be G only though?

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some devices are G specific and will lower the wireless casting rate of the main router/time capsule (i havent used a dual band as of yet..so im not sure if they can keep one downspeed for G devices and have a simultaneous N fullspeed cast...)

But from what I recall if you resetup the AEBSn froms cratch and select extend network and switch the radio mode to G only it should allow you to have G devices connect to that only.

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